※ 引述《surfingdream (Jimmyyeh)》之铭言： : Lyme disease is caused by a bacterium transmitted to humans by deer ticks. : Generally, deer ticks pick up the bacterium while in the larval stage by : feeding on infected white-footed mice. However, certain other species on : which the larvae feed do not harbor the bacterium. If the population of : these other species were increased, more of the larvae would be feeding on : uninfected hosts, so the number of ticks acquiring the bacterium would likely : decline. : Which of the following would it be most important to ascertain in evaluating : the argument? : A. Whether populations of the other species on which deer tick larvae feed : are found only in areas also inhabited by white-footed mice : B. Whether the size of the deer tick population is currently limited by the : availability of animals for the tick's larval stage to feed on 是否deer tick的 : C. Whether the infected deer tick population could be controlled by : increasing the number of animals that prey on white-footed mice : D. Whether deer ticks that were not infected as larvae can become infected as : adults by feeding on deer on which infected deer ticks have fed : E. Whether the other species on which deer tick larvae feed harbor any other : bacteria that ticks transmit to humans : 题目是说 因为其他品种的幼虫也会跟deer ticks抢东西吃，所以其他品种 : 数量增加，那麽disease就会变少吗? 不知道理解是否正确？ : 请问一下为何是答案B 不是C 我的理解是 deer ticks的larvae会吃有感染bacterium的老鼠，然後感染 现在有一种老鼠没有感染bacterium 如果这种没感染的老鼠增加，就可以使更多的larvae去吃这个老鼠 然後感染到的数量就会减少 -- 「啊，您现在的时光是多麽美好阿！」安娜继续说下去，「我记得，也曾熟悉这种蔚 蓝色的迷雾，就像是瑞士那些山巅上的雾一样。这种雾，它笼罩住那一段幸福时光中的一 切，那时候，童年时代眼看就要结束了，那段时光是一个巨大的天地，一个幸福、欢乐的 天地，往後的路就越来越窄了，於是就会愉快的、也是惊惶的走进这条通道，它看起来虽 说也是光明的、美丽的——谁没有走过这样一条路呢？」 ----安娜‧卡列妮娜 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 61.229.108.86 ※ 编辑: Imfine 来自: 61.229.108.86 (03/16 18:18)